diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/adc/xilinx-xadc-core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c index 23395fc5b267..0dd306d2c7f1 100644 --- a/drivers/iio/adc/xilinx-xadc-core.c +++ b/drivers/iio/adc/xilinx-xadc-core.c @@ -322,6 +322,7 @@ static irqreturn_t xadc_zynq_interrupt_handler(int irq, void *devid) #define XADC_ZYNQ_TCK_RATE_MAX 50000000 #define XADC_ZYNQ_IGAP_DEFAULT 20 +#define XADC_ZYNQ_PCAP_RATE_MAX 200000000 static int xadc_zynq_setup(struct platform_device *pdev, struct iio_dev *indio_dev, int irq) @@ -332,6 +333,7 @@ static int xadc_zynq_setup(struct platform_device *pdev, unsigned int div; unsigned int igap; unsigned int tck_rate; + int ret; /* TODO: Figure out how to make igap and tck_rate configurable */ igap = XADC_ZYNQ_IGAP_DEFAULT; @@ -343,6 +345,13 @@ static int xadc_zynq_setup(struct platform_device *pdev, if (!pcap_rate) return -EINVAL; + if (pcap_rate > XADC_ZYNQ_PCAP_RATE_MAX) { + ret = clk_set_rate(xadc->clk, + (unsigned long)XADC_ZYNQ_PCAP_RATE_MAX); + if (ret) + return ret; + } + if (tck_rate > pcap_rate / 2) { div = 2; } else { @@ -368,6 +377,12 @@ static int xadc_zynq_setup(struct platform_device *pdev, XADC_ZYNQ_CFG_REDGE | XADC_ZYNQ_CFG_WEDGE | tck_div | XADC_ZYNQ_CFG_IGAP(igap)); + if (pcap_rate > XADC_ZYNQ_PCAP_RATE_MAX) { + ret = clk_set_rate(xadc->clk, pcap_rate); + if (ret) + return ret; + } + return 0; } |